7+5r-4=9r+15-7r

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Solution for 7+5r-4=9r+15-7r equation:


Simplifying
7 + 5r + -4 = 9r + 15 + -7r

Reorder the terms:
7 + -4 + 5r = 9r + 15 + -7r

Combine like terms: 7 + -4 = 3
3 + 5r = 9r + 15 + -7r

Reorder the terms:
3 + 5r = 15 + 9r + -7r

Combine like terms: 9r + -7r = 2r
3 + 5r = 15 + 2r

Solving
3 + 5r = 15 + 2r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-2r' to each side of the equation.
3 + 5r + -2r = 15 + 2r + -2r

Combine like terms: 5r + -2r = 3r
3 + 3r = 15 + 2r + -2r

Combine like terms: 2r + -2r = 0
3 + 3r = 15 + 0
3 + 3r = 15

Add '-3' to each side of the equation.
3 + -3 + 3r = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 3r = 15 + -3
3r = 15 + -3

Combine like terms: 15 + -3 = 12
3r = 12

Divide each side by '3'.
r = 4

Simplifying
r = 4

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